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Ollie Locke is one of the contestants on Celebrity Island with Bear Grylls (Picture: David M. Benett/Dave Benett/Getty Images for Emporio Armani)

Ollie Locke has revealed a startling two and a half stone weight drop caused by appearing on Bear Grylls’ new show.

The 28-year-old reality star took part in Celebrity Island as part of Channel 4’s Stand Up To Cancer programming schedule.

The show saw Ollie left to survive on an island and the star said on Instagram he was given ‘nothing but a knife’ to survive (which, it is presumed, is the same knife he used to kill the crocodile that sparked condemnation from animal rights fans).

Ollie shared a photo of his dramatic weight drop online just days after he discussed his experience on ITV’s Lorraine.

‘We find ourselves on armchairs next to half the cast of Made in Chelsea. In a quiet moment I hear them sighing about having been asked to cast some “non-white friends”. Arterton widens her eyes at me with an OMG mouth, and moves her chair for a better look,’ Eva wrote in her article published on Sunday.